Carburetor



W. DECKER CARBURETOR May 19, 1931.

Filed May 29, 1924 INVENTOR. Ward Decker Patented May 19, 1931 UNITED, STATES are FFICE WARD DECKER, 0F TOLEDO, OHIO, ASSIGNOR TO THE WILLYS-OVERLAND COMPANY, OF

TOLEDO, OHIO, A CORPORATION OF OHIO CARBURETOR Application filed May 29, 1924.; Serial No. 716,668.

This invention relates to carburetors, and has for one object to provide an improved carbureting device adapted to better condition the mixture for starting the engine, whereby to economize both in the time required for starting, and in the fuel consumed.

Another object of the invention is to provide a carburetor in which the mixture employed for conditioning the engine at the time of starting and for use while idling, is heated and vaporized in a manner to produce extremely economical results in the operation of the engine.

Another object of the invention is to incorporate within or combine with acarburetor, simple and inexpensive means for improving the vaporization of the mixture which will also prevent it from becoming too highly heated and insure the desired volumetric efiiciency of the engine, both during starting and while idlin Another object of the invention is to provide acarburetor with a vaporizer disposed between the throttle and the fuel nozzle, in which the quantity of fuel vaporized, is regulated by the throttle or equivalent means disposed within the carburetor tube.

Other objects relating to details of construction and economies of manufacture, will appear from the description to follow, taken in connection with the accompanying drawings, forming a part of the present application, in which:

Fig. I is a. sectional elevation of a carburetor embodying the invention.

Fig. II is a sectional plan taken on line II-II of Fig. I, and

Fig. III is a fragmentary side elevation illustrating the operating mechanism for the carburetor valves.

In the drawings I have shown a preferred embodiment of the invention, the desired results being accomplished by the use of two separate valves, arranged one above the other.

Referring to Fig. I, 32 represents the carburetor tube, having a right angle air-inlet portion 33 in which the nozzle 34 and venturi 35 are disposed. The vertical portion of the tube is provided with a short inner tube 36 between the nozzle 34 and the upper throttle valve 37, the inner tube being also provided with a throttle valve 38 controlled by the operating means for the throttle 37 in a manner which will presently be described. ner tube is-preferably supported by lugs 39 at its lower end, extending inwardly from the wall of the tube, and is guided at its upper end between lugs 40 on said tube, as shown in Fig. I. A vaporizing passageway 4'lis afforded between the inner and outer tubes and is controlled by the upper throttle 37, while the passageway through tube 36 is controlled by the valve 38 subsequently to the opening of the valve 37. The wall 42 surrounding the vaporizing passageway 41, is, preferably heated by suitably controlled and regulated exhaust gases" from the en gine, passed through the heating chamber 43 surrounding that portion of the carburetor tube carrying the inner tube 36. z i

The throttle valve 37 is carried on a rotatably mounted'shaft 44having'an arm 45 extending therefrom and adapted to receive an operating connection (not shown), which may be'extended to any suitable point convenientto the reach of the driver ofthe ve hicle. The lower valve 38is carried by a shaft 46, preferably extended through and journaledin the walls of the heating chambar 43,-. one end of said shaft beingprovided with an operating-arm 47 having a slotted end portion 48, as shown'in FigIII. The upper shaft 44 is provided with a downwardly extendingrarm 49 and a connection 50'is interposed between said arm and the arm 47 of the shaft 46, the connection having a right angled portion51 slidable in the slotted end of the arm 47. The connection pivotally engages the upper-arm 49 and is provided with a shoulder 52 against which rests one end'ofa spring 53,'the other end of which rests against the slotted end: 48 of the arm 47. lVhen. the upper. valve 37 is. in closing position with respect to the vaporizing passageway 41, the operating devices for the valves will be in the position shown in Fig. III with the spring 53 holding the lower valve in "closed position. 7 I

O'n'starting the engine, the upper valve is so adjusted as to permit the desired quan-.

The intity of the mixture to flow through the heated passageway 41, whereby the charge is properly vaporized and a relatively rich mixture supplied to the engine. The upper valve may remain in any position of adjustment desired, and as long as desired, before opening the lower valve to permit the mixture to flow through the tube 36. It will be seen from Fig. III that the lower valve will not begin to open until the projection 51 on the connection 50 reaches the upper end of the slot in the arm 47. Continued movement of the arm 45 will cause the lower valve 38 to open while the upper valve is moving to afford the desired degree of opening for the carburetor tube, depending on the speed or load of the engine. With the engine running at high speeds or under heavy loads, the need for supplying heat to vaporize the fuel will not be very great, and it is during this time that both valves will remain open, so that practically all of the charge will flow through the inner tube 36, with but little, if any fuel discharging through the heated passageway 4:1. IVhen, however, the load is taken off the engine to the extent that the latter is idling, or to a degree approaching idling condition, where low gas consumption rather than high volumetric efliciency is the desideratum, then the throttle is in a nearly closed position and a large proportion of the gas being consumed passes over the heated walls and is expanded as well as thoroughly vaporized.

While I have shown in considerable detail,

a specific embodiment of my invention, it is to be understood that this showing and description are illustrative only, and that I do not regard the invention as limited to the details of construction illustrated and described, except in so far as I have included such limitations within the terms of the following claims.

I claim as my invention:

1. In a carbureting tube, a mixing chamber having a pairof concentricpassageways of uniform cross section, a throttle, valvewithin said mixing chamber above said passageways for closing said chamber, a second throttle valve within one of said passageways for closing the same, and a lost motion linkage connecting said valves whereby both valves may be in the closed position simultaneously and opened in sequence, and means for heating one of saidpassageways.

2. In a carbureting tube, a straight tubular mixing chamber, a relatively short tubular member therein and spaced therefrom for dividing said chamber into separate passageways, a throttle valve in said chamber above said tubular member for closing both passages, a butterfly valve within said tubular member for closing the same, a 10st motion linkage, connecting said valves whereby both 1 valves may be in the closed position simul-f taneously and opened in sequence and means for heating one of said passages.

3. In a carbureting tube, a straight tubular mixing chamber, a relatively short tubular member therein and spaced therefrom for dividing said chamber into inner and outer passages, a throttle valve in said chamber above said tubular member, a butterfly valve within said tubular member, a lost motion linkage connecting said valves whereby both valves may be in the closed position simultaneously and the mixing chamber valve may be opened in advance of the valve within the tubular member,

4. In a carburetor, ing concentric mixture passageways,

a mixing chamber havthrottle valve for controlling both passageways, a control rod for opening and closing said.

valve, a relatively long arm carried by said valve, a throttle valve for controlling one of said passageways, a relatively short arm carried by the last mentioned valve, and a link pivoted to said long arm and having a lost motion connection with said short arm.

In testimony whereof, I aifix my siguature.

WARD DECKER. 

